\documentclass{article}
\begin{document}

foo%
bar


    Now is the time for all good men to come to the aid of their country. Now % c1
    is the time for all good men to come to the aid of their country. %c2
    Now is the time for all good men to come to the aid of their country. Now%c3
    is the time for all good men to come to the aid of their country.%%%%c4
\end{document}
